使用特定格式将新列添加到数据框

Question

我在下面有一个示例数据框：

df <- data.frame(ID=c("131","156","178","196"), Date=c("03/31/2016","03/31/2016","03/31/2016","03/31/2016"))
df
   ID       Date
1 131 03/31/2016
2 156 03/31/2016
3 178 03/31/2016
4 196 03/31/2016

我想在此数据框中添加一个新列，其格式如下：=BDH("ID CUSIP", "PX_Last","Date")。新数据框应如下所示：

   ID       Date  NewCol
1 131 03/31/2016  =BDH("131 CUSIP", "PX_Last", "03/31/2016")
2 156 03/31/2016  =BDH("156 CUSIP", "PX_Last", "03/31/2016")
3 178 03/31/2016  =BDH("178 CUSIP", "PX_Last", "03/31/2016")
4 196 03/31/2016  =BDH("196 CUSIP", "PX_Last", "03/31/2016")

如您所见，ID和Date来自现有数据框，但CUSIP和PX_Last不是。请帮助，谢谢！

Answer 1

这样可以吗？

df$NewCol <- paste0("=BDH(\"", df$ID, " CUSIP\", \"PX_Last\", \"", df$Date, "\")")